Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f8165a175c96b6…

MALICIOUS

PDF

86.0 KB Created: 2021-05-24 01:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb48beff16d186a1680a68bfc7ad4a01 SHA-1: 64f505acdd890ee68bb8cd2b1c338d19278e94bd SHA-256: 11f8165a175c96b63c609d59ad5f54e22d72d95b42ca1c079ff162c126c8f17a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm, with the primary URL being a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests an attempt to drive traffic to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://golowaki.ru/strik?utm_term=rock+band+4+compatibility+xbox+one
    • https://zosujugopaw.weebly.com/uploads/1/3/4/5/134509911/nepamakalifitib.pdf
    • https://xonufixusunex.weebly.com/uploads/1/3/4/6/134610533/zazutowewujizix_tawifovuviz.pdf
    • https://static.s123-cdn-static.com/uploads/4367273/normal_5fca868e1022f.pdf
    • https://golagunowij.weebly.com/uploads/1/3/2/6/132695575/245900.pdf
    • https://xemegejimeje.weebly.com/uploads/1/3/1/6/131636808/tufovapemepuz.pdf
    • https://cdn-cms.f-static.net/uploads/4474980/normal_603246f03a25f.pdf
    • https://guzarimu.weebly.com/uploads/1/3/4/6/134608133/08acf3ad60.pdf
    • https://zulusoneruw.weebly.com/uploads/1/3/4/8/134887175/peduxuxere-zenutopenerazu-tidisovuzelita.pdf
    • https://bojufare.weebly.com/uploads/1/3/1/0/131070992/4989775.pdf
    • https://cdn-cms.f-static.net/uploads/4371514/normal_601edff67452a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5f3446fc-dab4-4290-8cde-8553598841f0/how_to_become_a_real_estate_agent_with_keller_williams.pdf
    • https://s3.amazonaws.com/xomudufe/53515091305.pdf
    • https://uploads.strikinglycdn.com/files/ec82b67b-3de9-4cac-a0ce-c8803699222b/texor.pdf
    • https://s3.amazonaws.com/wobuzisibal/technical_skills_vs_functional_skills.pdf
    • https://uploads.strikinglycdn.com/files/f7042914-55d0-4875-ac95-d1d1d14554d5/safe_haven_sales_rep_salary.pdf
    • https://s3.amazonaws.com/gotijejaj/vevokozetufenidug.pdf
    • https://uploads.strikinglycdn.com/files/1748b8da-fde6-41bc-8adc-91b08c9ac773/strong_spas_cyprus_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010eb1.bin
614fef41046e79dbb22c71e8ae2fb191166ac400367cdf9d63ac08a10f94ed0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB1 5412 bytes
font_01_sfnt_off00012128.bin
cf11698b6443910d4fcc08b4f8846895da2d3acaa6bffb1de3b39a2c624465c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12128 12276 bytes

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